Last week they were telling us The Truth About Sugar and now it's time to find out what the craic is with these calories. Chris van Tulleken runs a series of experiments on randomly selected supermarket foods, and finds that the labels we rely on for information aren't always accurate. He also looks at the best way to burn off these evil calorie folk and gets three families to engage in different activities after a big fry-up - from a tough workout at the gym to relaxing on the sofa. Chris also reveals some kitchen secrets to show how you can easily cut down on calories and still enjoy your favourite food... for realz.